CVE-2022-47937
📋 TL;DR
This vulnerability in Apache Sling Commons JSON allows attackers to cause denial of service or potentially execute arbitrary code by sending specially crafted JSON input. It affects any system using the deprecated org.apache.sling.commons.json bundle, particularly Apache Sling-based applications and services.
💻 Affected Systems
- Apache Sling Commons JSON bundle
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service causing application crashes and service disruption.
If Mitigated
Minimal impact with proper input validation and network segmentation in place.
🎯 Exploit Status
CVSS 9.8 indicates critical severity with network access and no authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://lists.apache.org/thread/sws7z50x47gv0c38q4kx6ktqrvrrg1pm
Restart Required: Yes
Instructions:
1. Remove org.apache.sling.commons.json bundle from your system. 2. Migrate to Apache Sling Commons Johnzon bundle or another supported JSON library. 3. Update all dependencies to use the new JSON library. 4. Restart affected services.
🔧 Temporary Workarounds
Input validation filter
allImplement strict input validation for JSON parsing to reject malformed input
Network isolation
allRestrict network access to affected services using firewalls or network segmentation
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block malformed JSON payloads
- Monitor for abnormal JSON parsing errors and implement rate limiting
🔍 How to Verify
Check if Vulnerable:
Check if org.apache.sling.commons.json bundle is installed in your OSGi container or application dependenciesCheck Version:
For OSGi: osgi:list | grep sling.commons.jsonVerify Fix Applied:
Confirm org.apache.sling.commons.json bundle is removed and replaced with Apache Sling Commons Johnzon or another supported JSON library📡 Detection & Monitoring
Log Indicators:
- JSON parsing errors
- Unexpected exceptions in JSON processing
- Application crashes during JSON handling
Network Indicators:
- Unusual JSON payloads in HTTP requests
- Repeated malformed JSON submissions
SIEM Query:
source="*apache*" AND ("JSON parsing error" OR "org.apache.sling.commons.json" OR "JSONException")🔗 References
- https://github.com/apache/sling-org-apache-sling-commons-johnzon
- https://issues.apache.org/jira/browse/SLING-6536
- https://lists.apache.org/thread/sws7z50x47gv0c38q4kx6ktqrvrrg1pm
- https://www.openwall.com/lists/oss-security/2023/05/15/2
- https://github.com/apache/sling-org-apache-sling-commons-johnzon
- https://issues.apache.org/jira/browse/SLING-6536
- https://lists.apache.org/thread/sws7z50x47gv0c38q4kx6ktqrvrrg1pm
- https://www.openwall.com/lists/oss-security/2023/05/15/2
